EXAMPLE: When I start my game and look at the wall and turn on/off my flashlight the wall has a weird Effect.
.Video Link of my Problem:
https://youtu.be/LFCOjhAkKHs
My Light Settings Below:
The popping-in and out is due to the normal map of your material and is totally normal. However, you still might want to go in photoshop and invert the green-channel of it, see if it improves your worry